2011-07-13 00:36:53 +00:00
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<#-- $This file is distributed under the terms of the license in /doc/license.txt$ -->
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<#assign shortVisualizationURLRoot ="/vis">
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<#assign refreshCacheURL = "${urls.base}${shortVisualizationURLRoot}/refresh-cache">
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<h2>Visualization Tools</h2>
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<a href="${refreshCacheURL}">Refresh Cached Models for Visualization</a>
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<h5>Why</h5>
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2011-07-21 21:08:14 +00:00
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Large-scale visualizations like the Temporal Graph or the Map of Science involve calculating total counts of publications or
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of grants for some entity. Since this means checking also through of its all sub-entities, the underlying queries can be both
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memory-intensive and time-consuming. For a faster user experience, we wish to save the results of these queries for later re-use.
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2011-07-13 00:36:53 +00:00
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<h5>What</h5>
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2011-07-21 21:08:14 +00:00
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To this end we have devised a caching solution which will retain information about the hierarchy of organizations-namely,
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which publications are attributed to which organizations-by storing the RDF model. <br />
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We're currently caching these models in memory. The cache is built (only once) on the first user request after a server restart.
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Because of this, the same model will be served until the next restart. This means that the data in these models may become stale
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depending upon when it was last created. This works well enough for now. In future releases we will improve this solution so that
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models are stored on disk and periodically updated.
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2011-07-13 00:36:53 +00:00
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<h5>How</h5>
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2011-07-21 21:08:14 +00:00
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The models are refreshed each time the server restarts. Since this is not generally practical on production instances,
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administrators can instead use the “refresh cache” link above to do this without a restart.
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<br />
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